This is the URL that you would use if you used the default eXist configuration

Note that the word "rest" is in the URL before the "/db" indicating that you are using the REST interface (as opposed to the WebDAV, Atom or SOAP interface)

Note that the port is "8080" (the default port for development web sites) and that the "context" of the server is "exist". Both of these can be easily changed by editing the $EXIST_HOME/tools/jetty/etc/conf.xml file and restarting your eXist server. The short-form on production sites might be: